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AC/DC Input voltage ? 2016-06-01T13:00:58+00:00

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  • Jon
    June 1, 2016 at 1:00 pm
    Post count: 0
    #5230 Reply |

    Hi there,

    I purchased one of your buck modules from Amazon: https://www.amazon.co.uk/gp/product/B00IKXTPBE/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

    I was trying to see if it accepts AC as well DC current ?
    I assumed there was no rectifier so that, if AC was used, AC is output ?
    Or is it DC only ?

    Thanks.
    J

    Jon
    June 1, 2016 at 7:12 pm
    Post count: 0
    #5232 Reply |

    Just to follow up with another query ..

    I have now received the item via Amazon today and hooked it up to a regulated 12v max 8A PSU.

    I have put both a volt meter and a normal multimeter across the output and adjusted both of the pots individually to adjust the voltage. However, no matter what I do, the output voltage remains as 12v – which is the same as the input!

    Surely it doesn’t need a load to operate properly ?
    It seems both the adjusters have no effect on the unit at all.
    Am I doing something wrong, or is the unit at fault ?

    J

    Drok
    Keymaster
    June 2, 2016 at 3:59 am
    Post count: 2971
    #5235 Reply |

    Hi Jon,
    Thank you for writing in.
    This item is a DC to DC buck converter, so both the input and the output are DC voltage.
    Could you please tell us more details of how you operate the product, such as the wiring, the working environment?
    If you can, we sincerely hope that you can send us some images or video to let check the problem details.
    Looking forward to hearing from you.
    Best regards

    Jon
    June 2, 2016 at 7:30 am
    Post count: 0
    #5237 Reply |

    Hi, thanks for the reply.

    I just started with the simplest setup – I have an old PC ATX supply with all the wires trimmed and just running the 12v line with black for ground. I had previously tested this supply and it operated as expected and it is rated at a max of 8A on the 12 volt line. I had previously tried it on the 3.3v and 5v but of course your circuit is 7v+

    The blue light on your circuit lights up and on testing the output lines, they just show the input voltage. Adjusting either of the screws on the potentiometers does nothing to the voltage at all. Neither of them has a ‘stop’ and both seem to just rotate around and around with no effect. The voltage stays at 12v

    I have nothing plugged in – apart from testing the LCD volt meter that I also purchased from you, so there is no load on the unit. I have tested the outputs with a multimeter though and the unit does not seem to adjust the voltage at all.

    Shall I enquire on Amazon, which is where I bought it ? I will try and add some photos tonight.

    Jon
    June 2, 2016 at 5:34 pm
    Post count: 0
    #5239 Reply |

    Update: I have tested the connect pins and the IN negative has continuity to the OUT negative – can someone tell me if this is correct ?

    I would be most grateful if I could get an answer on here.

    Many thanks.

    J

    Jon
    June 2, 2016 at 6:46 pm
    Post count: 0
    #5240 Reply |

    Ok – apologies, so after trying again and turning the onboard pots LOTS, they finally started to adjust – or the volts works at least, I have yet to load it and test the Amps.

    I assumed they operated more like a 270 degree large pot – when in actual fact they require much more turning to achieve any sort of adjustment.

    Drok
    Keymaster
    June 3, 2016 at 3:00 am
    Post count: 2971
    #5260 Reply |

    Hello Jon,
    Thank you for your detailed description.
    Does the product work normally now?
    If not, you can sent us an email(service at droking dot com) with some images or video of you wring to let us check the problem details.
    Best regards

    Jon
    June 3, 2016 at 7:46 am
    Post count: 0
    #5266 Reply |

    It seems to work pretty much as advertised, there are just a couple of things I would ask:

    I set the voltage and attach the load – the voltage then drops back down and I need to adjust it up to operate it or adjust the amps up slightly – I understand this to be normal though ?

    Could you tell me the meaning of the LED colours? I think there is blue and red.

    Thanks.

    J

    Drok
    Keymaster
    June 6, 2016 at 3:04 am
    Post count: 2971
    #5284 Reply |

    Hi Jon,
    If the voltage drops slightly, it is normal.
    If the voltage drops so much, you need to check if the lead wire is to thin.
    The LED indicator is for indicating the charging statue of the device.
    The red color means the the device is charging while the blue color means the device is full charged.
    Hope this can help you.
    Best regards

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